/Engine/Plugins/Runtime/MassEntity/Source/MassEntity/Public/MassProcessingTypes.h
Creates a runtime instance of every processors in the given array if there's no processor of that class in Processors already. Call this function when adding processors to an already configuredFMassRuntimePipelineinstance. If you're creating one from scratch calling any of the InitializeFrom* methods will be more efficient (and will produce same results) or call AppendOrOverrideRuntimeProcessorCopies.
void AppendUniqueRuntimeProcessorCopies ( TConstArrayView< const [UMassProcessor](API\Plugins\MassEntity\UMassProcessor) * > InProcessors, [UObject](API\Runtime\CoreUObject\UObject\UObject) & InOwner )